Activation energies, E_a, kJ mol⁻¹; frequency factors (ln A), yr⁻¹; and consensus Arrhenius equations for racemization rate constants (in which temperature T is in K and <i>k</i> is yr⁻¹).

<p>Values in bold are the median of bootstrap-simulated values and values in parentheses indicate +/−1 standard deviation. Consensus values are based on observed rate constants at all sediment depth for each amino acid.